| 21. | Then there is black shale or slate matching the Luarca Slate of Llanvirn to Caradocian Age.
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| 22. | In the Paleocene ( ) dark black shales mark the lack of oxygen in stagnant water.
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| 23. | The Upper Ordovician Lower Silurian materials there contain a roughly thick, carbon-rich layer of black shale.
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| 24. | Its bedrock is Precambrian-era gray and black shale.
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| 25. | But the clincher was the green itself, backed by an amphitheater-like natural outcropping of black shale.
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| 26. | The deposit was formed by remobilsation of uranium already enriched in the black shales by synsedimentary processes.
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| 27. | The rock underlying the dam is Ohio Black Shale which is a largely hard, massive silt shale.
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| 28. | A rock formation known as the Campbell's Ledge Black Shale occurs in the vicinity of Leggetts Creek.
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| 29. | Calcareous shales and black shales also occur.
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| 30. | Wismut explored a black shale-type uranium mineralisation below the villages of Hauptmannsgr�n and Neumark, Saxony west of Zwickau.
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